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572                EXTERNAL CHARACTERS OF GORILLA               CHAP.

and it is a curious fact that the Siamang, which has a large
laryngeal pouch, is not excelled in this respect by species in
which this sao is nofc developed.


Fio. 273.—Cerebrum of the Gibbon (Ifylobatss). (Lateral aspect.), c.c", Anterior
and posterior central convolution ; fL, Interparietal fissure ; jfr, frontal lobe ;
f.s, Sylvian fissure ; oc, occipital lobe ; pat parietal lobe ; s.c> fissure of Holando;
tpt temporal lobe; *, fronto - orbital fissure. (From Wiedersheim's Structure of
Of Gorillas, genus Gorilla, there is but one species, which must
apparently and rather unfortunately "be called Gorilla gorilla.
The misfortune is double : in the first place the repetition of
the same word as both generic and specific appellation is tiresome
to the ears and barbarous in its suggestion ; in the second place
it is now well known that the ** Gorilla M of Hanno, observed by that
Carthaginian voyager on an island off the African coast, was not
a G-orilla at all as the word is now understood, but probably a
Baboon. The external aspect of this great Anthropoid is familiar
from many reproductions. The male, as is usual, is larger than
the female, and his characters are more pronounced-
The face is naked and black, and the skii?, generally is deep
black, even at birth. The ear is comparatively small, and is
adpressed to the side of the head; it is altogether more human
in form than that of the Chimpanzee, and this statement applies
also to the rudimentary condition of the muscles of the ear,
which are more rudimentary than in the Chimpanzee. The nose
has an obvious median ridge, and is thus pronounced as an external
feature; the nostrils are very wide. The hands and feet are
short, thick, and "broad; the digits are webbed. In the foot the
heel is more apparent than in other Anthropoids, It is not,